[RFC][PATCH 1/3] Embed vmcoreinfo into kernel file
Bernhard Walle
bwalle at suse.de
Fri Aug 17 05:44:07 EDT 2007
Hi,
* Ken'ichi Ohmichi <oomichi at mxs.nes.nec.co.jp> [2007-08-17 08:43]:
>
> Thank you for good comments.
> I updated the patch for applying your comments.
Instead of providing empty implementations of arch_save_vmcoreinfo()
for each architecture that doesn't need that hook, I'd suggest to use
one default implementation with __attribute((weak)) that gets
overwritten by architecture implementations. See my patch below:
Signed-off-by: Dan Aloni <da-x at monatomic.org>
Signed-off-by: Ken'ichi Ohmichi <oomichi at mxs.nes.nec.co.jp>
Signed-off-by: Bernhard Walle <bwalle at suse.de>
---
arch/i386/kernel/machine_kexec.c | 13 ++++
arch/ia64/kernel/machine_kexec.c | 22 +++++++
arch/ia64/mm/discontig.c | 2
arch/x86_64/kernel/machine_kexec.c | 9 +++
include/asm-ia64/numa.h | 1
include/linux/kexec.h | 23 ++++++++
kernel/kexec.c | 103 +++++++++++++++++++++++++++++++++++++
kernel/ksysfs.c | 10 +++
8 files changed, 182 insertions(+), 1 deletion(-)
--- a/arch/i386/kernel/machine_kexec.c
+++ b/arch/i386/kernel/machine_kexec.c
@@ -10,6 +10,7 @@
#include <linux/kexec.h>
#include <linux/delay.h>
#include <linux/init.h>
+#include <linux/numa.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
@@ -169,3 +170,15 @@ static int __init parse_crashkernel(char
return 0;
}
early_param("crashkernel", parse_crashkernel);
+
+void arch_crash_save_vmcoreinfo(void)
+{
+#ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE
+ SYMBOL(node_data);
+ LENGTH(node_data, MAX_NUMNODES);
+#endif
+#ifdef CONFIG_X86_PAE
+ CONFIG(X86_PAE);
+#endif
+}
+
--- a/arch/ia64/kernel/machine_kexec.c
+++ b/arch/ia64/kernel/machine_kexec.c
@@ -15,10 +15,12 @@
#include <linux/cpu.h>
#include <linux/irq.h>
#include <linux/efi.h>
+#include <linux/numa.h>
#include <asm/mmu_context.h>
#include <asm/setup.h>
#include <asm/delay.h>
#include <asm/meminit.h>
+#include <asm/mmzone.h>
typedef NORET_TYPE void (*relocate_new_kernel_t)(
unsigned long indirection_page,
@@ -125,3 +127,23 @@ void machine_kexec(struct kimage *image)
unw_init_running(ia64_machine_kexec, image);
for(;;);
}
+
+void arch_crash_save_vmcoreinfo(void)
+{
+#ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE
+ SYMBOL(pgdat_list);
+ LENGTH(pgdat_list, MAX_NUMNODES);
+
+ SYMBOL(node_memblk);
+ LENGTH(node_memblk, NR_NODE_MEMBLKS);
+ SIZE(node_memblk_s);
+ OFFSET(node_memblk_s, start_paddr);
+ OFFSET(node_memblk_s, size);
+#endif
+#ifdef CONFIG_PGTABLE_3
+ CONFIG(PGTABLE_3);
+#elif CONFIG_PGTABLE_4
+ CONFIG(PGTABLE_4);
+#endif
+}
+
--- a/arch/ia64/mm/discontig.c
+++ b/arch/ia64/mm/discontig.c
@@ -47,7 +47,7 @@ struct early_node_data {
static struct early_node_data mem_data[MAX_NUMNODES] __initdata;
static nodemask_t memory_less_mask __initdata;
-static pg_data_t *pgdat_list[MAX_NUMNODES];
+pg_data_t *pgdat_list[MAX_NUMNODES];
/*
* To prevent cache aliasing effects, align per-node structures so that they
--- a/arch/x86_64/kernel/machine_kexec.c
+++ b/arch/x86_64/kernel/machine_kexec.c
@@ -10,6 +10,7 @@
#include <linux/kexec.h>
#include <linux/string.h>
#include <linux/reboot.h>
+#include <linux/numa.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
@@ -257,3 +258,11 @@ static int __init setup_crashkernel(char
}
early_param("crashkernel", setup_crashkernel);
+void arch_crash_save_vmcoreinfo(void)
+{
+#ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE
+ SYMBOL(node_data);
+ LENGTH(node_data, MAX_NUMNODES);
+#endif
+}
+
--- a/include/asm-ia64/numa.h
+++ b/include/asm-ia64/numa.h
@@ -24,6 +24,7 @@
extern u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned;
extern cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned;
+extern pg_data_t *pgdat_list[MAX_NUMNODES];
/* Stuff below this line could be architecture independent */
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -121,6 +121,21 @@ extern struct page *kimage_alloc_control
extern void crash_kexec(struct pt_regs *);
int kexec_should_crash(struct task_struct *);
void crash_save_cpu(struct pt_regs *regs, int cpu);
+void crash_save_vmcoreinfo(void);
+void arch_crash_save_vmcoreinfo(void);
+void vmcoreinfo_append_str(const char *fmt, ...);
+
+#define SYMBOL(name) \
+ vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
+#define SIZE(name) \
+ vmcoreinfo_append_str("SIZE(%s)=%d\n", #name, sizeof(struct name))
+#define OFFSET(name, field) \
+ vmcoreinfo_append_str("OFFSET(%s.%s)=%d\n", #name, #field, &(((struct name *)0)->field))
+#define LENGTH(name, value) \
+ vmcoreinfo_append_str("LENGTH(%s)=%d\n", #name, value)
+#define CONFIG(name) \
+ vmcoreinfo_append_str("CONFIG_%s=%c\n", #name, CONFIG_##name)
+
extern struct kimage *kexec_image;
extern struct kimage *kexec_crash_image;
@@ -148,11 +163,19 @@ extern struct kimage *kexec_crash_image;
#define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */
+#define VMCOREINFO_BYTES (4096)
+#define VMCOREINFO_NOTE_NAME "VMCOREINFO"
+#define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
+#define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
+ + VMCOREINFO_NOTE_NAME_BYTES)
+
/* Location of a reserved region to hold the crash kernel.
*/
extern struct resource crashk_res;
typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
extern note_buf_t *crash_notes;
+extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
+extern unsigned int vmcoreinfo_size;
#else /* !CONFIG_KEXEC */
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -22,16 +22,26 @@
#include <linux/hardirq.h>
#include <linux/elf.h>
#include <linux/elfcore.h>
+#include <linux/utsrelease.h>
+#include <linux/utsname.h>
+#include <linux/numa.h>
#include <asm/page.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/semaphore.h>
+#include <asm/sections.h>
/* Per cpu memory for storing cpu states in case of system crash. */
note_buf_t* crash_notes;
+/* vmcoreinfo stuff */
+unsigned char vmcoreinfo_data[VMCOREINFO_BYTES];
+u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
+unsigned int vmcoreinfo_size = 0;
+unsigned int vmcoreinfo_max_size = sizeof(vmcoreinfo_data);
+
/* Location of the reserved area for the crash kernel */
struct resource crashk_res = {
.name = "Crash kernel",
@@ -1135,3 +1145,96 @@ static int __init crash_notes_memory_ini
return 0;
}
module_init(crash_notes_memory_init)
+
+void crash_save_vmcoreinfo(void)
+{
+ u32 *buf;
+
+ if (!vmcoreinfo_size)
+ return;
+
+ buf = (u32 *)vmcoreinfo_note;
+
+ buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
+ vmcoreinfo_size);
+
+ final_note(buf);
+}
+
+void vmcoreinfo_append_str(const char *fmt, ...)
+{
+ va_list args;
+ char buf[0x50];
+ int r;
+
+ va_start(args, fmt);
+ r = vsnprintf(buf, sizeof(buf), fmt, args);
+ va_end(args);
+
+ if (r + vmcoreinfo_size > vmcoreinfo_max_size)
+ r = vmcoreinfo_max_size - vmcoreinfo_size;
+
+ memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
+
+ vmcoreinfo_size += r;
+}
+
+/*
+ * provide an empty default implementation here -- architecture
+ * code may override this
+ */
+void __attribute__ ((weak)) arch_crash_save_vmcoreinfo(void)
+{}
+
+static int __init crash_save_vmcoreinfo_init(void)
+{
+ vmcoreinfo_append_str("OSRELEASE=%s\n", UTS_RELEASE);
+ vmcoreinfo_append_str("PAGESIZE=%d\n", PAGE_SIZE);
+
+ SYMBOL(init_uts_ns);
+ SYMBOL(node_online_map);
+ SYMBOL(swapper_pg_dir);
+ SYMBOL(_stext);
+
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+ SYMBOL(mem_map);
+ SYMBOL(contig_page_data);
+#endif
+#ifdef CONFIG_SPARSEMEM
+ SYMBOL(mem_section);
+ LENGTH(mem_section, NR_SECTION_ROOTS);
+ SIZE(mem_section);
+ OFFSET(mem_section, section_mem_map);
+#endif
+ SIZE(page);
+ SIZE(pglist_data);
+ SIZE(zone);
+ SIZE(free_area);
+ SIZE(list_head);
+ OFFSET(page, flags);
+ OFFSET(page, _count);
+ OFFSET(page, mapping);
+ OFFSET(page, lru);
+ OFFSET(pglist_data, node_zones);
+ OFFSET(pglist_data, nr_zones);
+#ifdef CONFIG_FLAT_NODE_MEM_MAP
+ OFFSET(pglist_data, node_mem_map);
+#endif
+ OFFSET(pglist_data, node_start_pfn);
+ OFFSET(pglist_data, node_spanned_pages);
+ OFFSET(pglist_data, node_id);
+ OFFSET(zone, free_area);
+ OFFSET(zone, vm_stat);
+ OFFSET(zone, spanned_pages);
+ OFFSET(free_area, free_list);
+ OFFSET(list_head, next);
+ OFFSET(list_head, prev);
+ LENGTH(zone.free_area, MAX_ORDER);
+
+ arch_crash_save_vmcoreinfo();
+ crash_save_vmcoreinfo();
+
+ return 0;
+}
+
+module_init(crash_save_vmcoreinfo_init)
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -60,6 +60,15 @@ static ssize_t kexec_crash_loaded_show(s
return sprintf(page, "%d\n", !!kexec_crash_image);
}
KERNEL_ATTR_RO(kexec_crash_loaded);
+
+static ssize_t vmcoreinfo_show(struct kset *kset, char *page)
+{
+ return sprintf(page, "%lx %x\n",
+ __pa((unsigned long)(char *)&vmcoreinfo_note),
+ vmcoreinfo_size);
+}
+KERNEL_ATTR_RO(vmcoreinfo);
+
#endif /* CONFIG_KEXEC */
decl_subsys(kernel, NULL, NULL);
@@ -73,6 +82,7 @@ static struct attribute * kernel_attrs[]
#ifdef CONFIG_KEXEC
&kexec_loaded_attr.attr,
&kexec_crash_loaded_attr.attr,
+ &vmcoreinfo_attr.attr,
#endif
NULL
};
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